Joya Mia's Joya Mia's O2 Flow Air Purifier Filter comes in a set of 2 filter True HEPA Filter, Activated Carbon Filter Dual H13 Ture HEPA Filters: Combined activated carbon and a true HEPA filter to deliver true HEPA performance capturing 99.97% of particulates and allergens larger than 0.3 microns. * 3-layer filter to ensure the purest air delivered * Pre-Filter: PM10 particle pollution elimination, Pet dander, hair, dust mites, debris * HEPA Filter: PM 2.5 particle pollution matter elimination, Bacteria, mold, pollutants, and viruses * Carbon Filter: layer eliminates odor